Active galactic nuclei and galaxy interactions

We perform a statistical analysis of active galactic nucleus (AGN) host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the Sloan Digital Sky Survey Data Release 4 data by Kauffmann et al. and pair galaxies obtained from...

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Autores principales:	Alonso, M.S., Lambas, D.G., Tissera, P., Coldwell, G.
Formato:	JOUR
Materias:	Cosmology: theory Galaxies: evolution Galaxies: formation
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00358711_v375_n3_p1017_Alonso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00358711_v375_n3_p1017_Alonso
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spelling	todo:paper_00358711_v375_n3_p1017_Alonso2023-10-03T14:46:48Z Active galactic nuclei and galaxy interactions Alonso, M.S. Lambas, D.G. Tissera, P. Coldwell, G. Cosmology: theory Galaxies: evolution Galaxies: formation We perform a statistical analysis of active galactic nucleus (AGN) host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the Sloan Digital Sky Survey Data Release 4 data by Kauffmann et al. and pair galaxies obtained from the same data set by Alonso et al. An eye-ball classification of images of 1607 close pairs (rp < 25 kpc h-1, Δ V < 350 km s -1) according to the evidence of interaction through distorted morphologies and tidal features provides us with a more confident assessment of galaxy interactions from this sample. We notice that, at a given luminosity or stellar mass content, the fraction of AGNs is larger for pair galaxies exhibiting evidence for strong interaction and tidal features which also show signs of strong star formation activity. Nevertheless, this process accounts only for a ̃10 per cent increase of the fraction of AGNs. As in previous works, we find AGN hosts to be redder and with a larger concentration morphological index than non-AGN galaxies. This effect does not depend on whether AGN hosts are in pairs or in isolation. The O III luminosity of AGNs with strong interaction features is found to be significantly larger than that of other AGNs, either in pairs or in isolation. Estimations of the accretion rate, L[O III]/MBH, show that AGNs in merging pairs are actively feeding their black holes, regardless of their stellar masses. We also find that the luminosity of the companion galaxy seems to be a key parameter in the determination of the black hole activity. At a given host luminosity, both the O III luminosity and the L[O III]/MBH are significantly larger in AGNs with a bright companion (Mr < -20) than otherwise. © 2007 RAS. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v375_n3_p1017_Alonso
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cosmology: theory Galaxies: evolution Galaxies: formation
spellingShingle	Cosmology: theory Galaxies: evolution Galaxies: formation Alonso, M.S. Lambas, D.G. Tissera, P. Coldwell, G. Active galactic nuclei and galaxy interactions
topic_facet	Cosmology: theory Galaxies: evolution Galaxies: formation
description	We perform a statistical analysis of active galactic nucleus (AGN) host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the Sloan Digital Sky Survey Data Release 4 data by Kauffmann et al. and pair galaxies obtained from the same data set by Alonso et al. An eye-ball classification of images of 1607 close pairs (rp < 25 kpc h-1, Δ V < 350 km s -1) according to the evidence of interaction through distorted morphologies and tidal features provides us with a more confident assessment of galaxy interactions from this sample. We notice that, at a given luminosity or stellar mass content, the fraction of AGNs is larger for pair galaxies exhibiting evidence for strong interaction and tidal features which also show signs of strong star formation activity. Nevertheless, this process accounts only for a ̃10 per cent increase of the fraction of AGNs. As in previous works, we find AGN hosts to be redder and with a larger concentration morphological index than non-AGN galaxies. This effect does not depend on whether AGN hosts are in pairs or in isolation. The O III luminosity of AGNs with strong interaction features is found to be significantly larger than that of other AGNs, either in pairs or in isolation. Estimations of the accretion rate, L[O III]/MBH, show that AGNs in merging pairs are actively feeding their black holes, regardless of their stellar masses. We also find that the luminosity of the companion galaxy seems to be a key parameter in the determination of the black hole activity. At a given host luminosity, both the O III luminosity and the L[O III]/MBH are significantly larger in AGNs with a bright companion (Mr < -20) than otherwise. © 2007 RAS.
format	JOUR
author	Alonso, M.S. Lambas, D.G. Tissera, P. Coldwell, G.
author_facet	Alonso, M.S. Lambas, D.G. Tissera, P. Coldwell, G.
author_sort	Alonso, M.S.
title	Active galactic nuclei and galaxy interactions
title_short	Active galactic nuclei and galaxy interactions
title_full	Active galactic nuclei and galaxy interactions
title_fullStr	Active galactic nuclei and galaxy interactions
title_full_unstemmed	Active galactic nuclei and galaxy interactions
title_sort	active galactic nuclei and galaxy interactions
url	http://hdl.handle.net/20.500.12110/paper_00358711_v375_n3_p1017_Alonso
work_keys_str_mv	AT alonsoms activegalacticnucleiandgalaxyinteractions AT lambasdg activegalacticnucleiandgalaxyinteractions AT tisserap activegalacticnucleiandgalaxyinteractions AT coldwellg activegalacticnucleiandgalaxyinteractions
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Active galactic nuclei and galaxy interactions

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